Quasi-periodic scintillations at mid-latitudes and their possible association with ionospheric sporadic-E structures

Details Quasi-periodic scintillations at mid-latitudes and their possible association with ionospheric sporadic-E structures Quasi-periodic scintillations at mid-latitudes and their possible association with ionospheric sporadic-E structures

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989angeo...7..259b&link_type=abstract

Annales Geophysicae (ISSN 0980-8752), vol. 7, June 1989, p. 259-267. Research supported by the Australian Research Council.

Computer Science

Sound

13

Ionospheric Sounding, Midlatitude Atmosphere, Scintillation, Sporadic E Layer, Diffraction Patterns, Satellite Observation

Scientific paper

Quasi-periodic (QP) scintillations recorded at Brisbane, Australia from an orbiting earth satellite transmitting at a frequency of 150 MHz are examined. The principal analysis investigates a multiple event involving a series of seven (what appear to be) Fresnel diffraction patterns recorded over a period of about 80 s on October 22, 1987. Diffraction patterns, closely resembling two of the recorded patterns, have been calculated using a Cornu spiral along with accurate information on the location of the satellite during recordings. The experimental results reported here and elsewhere suggest that QP scintillation patterns are produced by Fresnel diffraction involving high electron-density concentrations. These frontal concentrations with widths of the order of 100 m are effectively opaque strips for the frequency being used. The evidence suggests that these strips are located in sporadic-E clouds consisting of fronts spaced from one another by around 20 km and travelling perpendicular to the fronts at speeds in the range 50-100 ms. The electron-density concentrations associated with the seven QP patterns of the multiple event investigated were found to be spaced from one another by an average distance of 11 km. Prior warnings of signal-strength modifications (caused by QP scintillations) for satellites used for communications may be possible if the proposed association with moving sporadic-E clouds proves to be correct.

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